Washerless removable-tip hypodermic syringe



F. L. PLATT ET AL WASHERLESS REMOVABLE TIP HYPODERMIC SYRINGE Filed Aug. 17, 1922 Even if 02 3.

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Patelited Sept. 16, 1924.

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Application filed August 17, 1922. Serial no. 582,370.

To all whom it may concem:

Be it known that we, FRANK L. Pm'r'r, Gnonon N. Ham, and ROBERT R. IMPEY, citizens of the United States, residing at the city and count of San Francisco and State of California, ll useful Im rovements in Washerless Removable-Tip ypodermic Syringes, of which the following is a specification.

In our previous inventions relating to hypodermic syringes, 'we have employed between the needle base and the end extending from the syringe barrel a packing gland,

preferably of tin. This construction is expensive, and while efi'ective, requires considerable machine work in the production of the article.

This invention is designed'to provide a fluid tight joint between the part projecting from the barrel and the needle base, and is accomplished by afi'ordin a tapering seat between the two parts an forcing the parts into engagement with a wiping action.

With the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings and ointed out in the claims hereto appended; it being under-v stood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departin from the spirit or sacrificing any of the a vantages of the invention.

To more clearly comprehend the invention, reference is directed to the accompanying drawings, wherein- Fig. 1 is a view in side elevation of a hyodermic syringe.

ig. 2 is a longitudinal, central, sectional view of the tip end of a syringe, disclosing the referred embodiment of our invention.

Fig. 3 is a section taken on line 33 of Fig. 2.

Fig. 4. is a view in elevation, partly in section, of the removable coupling illustrated in the present embodiment of the invention. b Fig. 5 is a view in elevation of the needle ase.

Referring more particularly to the draw.- ings, wherein like characters of reference designate corresponding parts-1 indicates a conventional barrel, within which is the plunger 2.

ave invented certain new and In the present embodiment, a removable tip 3 is mountd in the discharge opening 4 '6, to the outer threaded end of which is connected the adapter 7 formed with a polygonal recess 8 in which is received the polygonal portion of the needle base 9 mounting a tubular needle 10. The free end of the base 9 is of conical formation, as at 11, to be received in the recess 5 of tip 3..

It will be observed that the base 9 is insertable within the recess 8, and on the coupling of the parts 7 and 6, the ta ring end 11 of the needle base is force into 'the recess 5 of the tip 3 with a wiping action, providing a fluid tight joint, which is adapt ed to be made without the aid of a wrench and by the pressure of the fingers.

We claim i 1. A hypodermic syringe including a tubular barrel provided with a discharge orifice, a needle, a tubular base mounting the needle, said base formed with a conical end and a polygonal periphery, a tubular part associated with the barrel and provided with a' conical seat in which the conical end of said base is received, and a tubular member for receiving said needle and the base and adapted for seating said conical needle,

base in said conical seat with a wiping action.

2. A hypodermic syringe including a tubular bar-rel provided at its discharge end with a tubular tip formed at its end with a tapering recessed seat, a tubular needle, a tubular base mounting the same and formed with an outwardly tapering end for reception within said recessed seat, and means engaging the needle base to cause the tion, a needle and needle base removably receivable within one of said parts and held for rotation therewith on the assembling and disassembling of said two tubular parts, said hese provided with c tepering endndepted for reception within at corresponding recese with. coo erntin g welleinfrictionel contect to provi e e fluid tight oint. r 5 5. A; hypodermic syringe including a tubular tip provided at its end with e receee, e tubular member for securing to the syrine at the end of said tip, it needle end i bese removehl carried by seid tuhnler memher to rotate t erewitl1,soid needle heee provided with an end adnfited for reception within seid tip recess wit cooperetin wells in direct contnct to provide it flni tight 'oint on the threading of seid tnhnlermem- H6 er in position et the outer end of en d tip. 6. A hypodermic syringe including in polygonal neeneee' orifice, e needle; n tnhnler heee monntin, t e

needle, seid heee heing icormed wit n erighery, e tiihnlnr ert on at secreted wit t e herrelend provi ed with n conienl sent in which the end of said hnse is received, and n tuloulnr member fior receiving seid needle end seid bese end edepted for forcing the well of seid needle 2e hese into engngement with the well of snid conicel'sent with e wiping notion.

In testimony whereof we heve signed our nnnies to this specifi ntion,

RANK L, PLA'ILT. GEURGTE N. lBDElN. RK'DBT. R-IMPEY. 

